Typhoon 2+2

[george kennie]

Boy,........Wouldn't that be great!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
G.

Ed Miller wrote:

> I second that......I vaguely remember a Dean.....
> So you back ???
> Ed M.
> ----- Original Message -----
> From: "Joe Lachowski" <jlachow at hotmail.com>
> To: <discussion at nsrca.org>
> Sent: Thursday, January 30, 2003 1:03 PM
> Subject: RE: Typhoon 2+2
>
> > Dean Pappas?? Who Dat?
> >
> >
> > >From: "Dean Pappas" <d.pappas at kodeos.com>
> > >Reply-To: discussion at nsrca.org
> > >To: <discussion at nsrca.org>
> > >Subject: RE: Typhoon 2+2
> > >Date: Thu, 30 Jan 2003 13:01:13 -0500
> > >
> > >Hello Larry,
> > >
> > >You want to preserve the location of the point that is 25% of the M.A.C.
> > >(mean aerodynamic chord)
> > >That preserves the moment arm lengths, balance point, yaw damping and
> > >just about any other trimming behavior.
> > >
> > >As an approximation, go half-way out on the wing panel (actually closer
> > >to the root) find the point at 25% of that chord, and rotate things
> > >around that point.
> > >Your 35-inch panel is actually a 38 or so inch panel , from the cl of
> > >the model. I am assuming about a 6" fuse width.
> > >The error won't matter a bunch.
> > >The MAC is 16.4" from the model centerline.
> > >The 25% point is 10.5" forward of the trailing edge, that far out.
> > >That's the spot that needs to stand still.
> > >The tip has to move forward about 30% more than the amount the root
> > >moves back, in order to preserve the 25% MAC position.
> > >
> > >I presented the graphical method cor calculating the MAC somne time ago
> > >in Flying Models, but maybe it's time for a repeat.
> > >
> > >Wing sweep contributes a dihedral effect when the wing is lifting.
> > >That's not the case in Knife Edge, so the
> > >roll coupling in KE flight should not change.
> > >Regards
> > >     Dean Pappas
> > >
> > >
> > >-----Original Message-----
> > >From: Larry Diamond [mailto:ldiamon at kimball.com]
> > >Sent: Thursday, January 30, 2003 11:49 AM
> > >To: NSRCA
> > >Subject: Typhoon 2+2
> > >
> > >
> > >
> > >I'm planning on scratch building a Typhoon 2+2. Just received the
> > >plans...
> > >
> > >In following a number of threads and talking to a few people I have some
> > >design questions...
> > >
> > >I plan on reducing the wing to about 975sqin and tapering the trailing
> > >edge forward about 1" (about 1 1/2 degrees). This is based on
> > >conversations of what some have found to perform better for stall spins
> > >and snaps.
> > >
> > >Rough estimates.
> > >
> > >Root rib - about 18
> > >Tip Rib - about 8
> > >Panel span - about 35 to 35.5.
> > >Airfoil - same as plans for T2+2.
> > >Don't plan on changing the stab unless advised to.
> > >
> > >Accounting for CG appears to have three options.
> > >
> > >1) Move the wing tube hole in the fuse back.
> > >2) Move the wing tube hole in the wing panels forward.
> > >3) Combination of the two.
> > >
> > >Which is preferred and what effects does it have on other performance?
> > >
> > >I'm at a loss for how this might effect the dihedral. Still keep the top
> > >of the wing flat and let the bottom fall where it may.
> > >
> > >The intent of the plan will be to fly intermediate and take me into
> > >advanced. I have some books on design on the way. However, I would like
> > >to understand the relationships from practical experience.
> > >
> > >The easy answer is to use a wing configuration that someone else has
> > >that is tried and proven. I would be open to this. But would still be
> > >interested in any thoughts for design.
> > >
> > >Perhaps this could be a good tech article for the K-Factor or possibly a
> > >running series.
> > >
> > >Larry
> > >NSRCA 3083
> > >AMA 5024
> > >
> >
> >
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> >
> >
>
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